From patchwork Wed Jul 24 14:00:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Usyskin X-Patchwork-Id: 13740976 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 69958C3DA7E for ; Wed, 24 Jul 2024 14:09:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 504B210E6E7; Wed, 24 Jul 2024 14:09:34 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="QrYwrmxV"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id F2F6510E6E5; Wed, 24 Jul 2024 14:09:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1721830155; x=1753366155; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=2uaDlZD0uMy4pTVqQ0jeYFWBfu/L/qwRKStrAtd4+nU=; b=QrYwrmxVG8MKyMiipmH1r4DTPnn+Mi/X0/IPkDYpPMmM/GEzUehVPQFz ToIEUIx9RTtTWnp7p3SU+Xd/gaRYjc2AEdXNw4pHtXnN9bc1VpdyujMm7 hQa5nOMtRF55eB4QXGTZIo35TwxuW/gMimPodf2MOUJoJst15bFCLAYu+ C0apfYGLZz+GQsaObTeMizwPcabzQB7KR4mjK26YKjk4xkIb6N/otW2Bi aLQbeWow9gLAbDQs8KalKE4+RNB0GeSPaunCJrdeHkeXowvjeG747rlGR Hfxx6aiNYm6ruJEi2mvdigpRHSJMLzBlM2K3YRD3/lj8iNMMlMtk8sDVY A==; X-CSE-ConnectionGUID: Cya3PBW0TxaDKtq4wace1Q== X-CSE-MsgGUID: o7qRePpDRQOIjRcQH8JkTA== X-IronPort-AV: E=McAfee;i="6700,10204,11143"; a="30173771" X-IronPort-AV: E=Sophos;i="6.09,233,1716274800"; d="scan'208";a="30173771" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jul 2024 07:09:14 -0700 X-CSE-ConnectionGUID: WdKlyL5/T+GQVhLOs5V+wQ== X-CSE-MsgGUID: vzcqRJfiQoaC5yPdBjFQhg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,233,1716274800"; d="scan'208";a="83211476" Received: from sannilnx-dsk.jer.intel.com ([10.12.231.107]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jul 2024 07:09:10 -0700 From: Alexander Usyskin To: Mark Brown , Lucas De Marchi , Oded Gabbay , =?utf-8?q?Thomas_Hellstr=C3=B6m?= , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin Cc: Tomas Winkler , Alexander Usyskin , Vitaly Lubart , intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-spi@vger.kernel.org, intel-gfx@lists.freedesktop.org Subject: [PATCH v2 06/12] spi: intel-dg: align 64bit read and write Date: Wed, 24 Jul 2024 17:00:08 +0300 Message-Id: <20240724140014.428991-7-alexander.usyskin@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240724140014.428991-1-alexander.usyskin@intel.com> References: <20240724140014.428991-1-alexander.usyskin@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" GSC SPI HW errors on quad access overlapping 1K border. Align 64bit read and write to avoid readq/writeq over 1K border. Signed-off-by: Alexander Usyskin --- drivers/spi/spi-intel-dg.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/drivers/spi/spi-intel-dg.c b/drivers/spi/spi-intel-dg.c index dc4d6c573522..534e99cb336d 100644 --- a/drivers/spi/spi-intel-dg.c +++ b/drivers/spi/spi-intel-dg.c @@ -231,6 +231,24 @@ static ssize_t spi_write(struct intel_dg_spi *spi, u8 region, len_s -= to_shift; } + if (!IS_ALIGNED(to, sizeof(u64)) && + ((to ^ (to + len_s)) & GENMASK(31, 10))) { + /* + * Workaround reads/writes across 1k-aligned addresses + * (start u32 before 1k, end u32 after) + * as this fails on hardware. + */ + u32 data; + + memcpy(&data, &buf[0], sizeof(u32)); + spi_write32(spi, to, data); + if (spi_error(spi)) + return -EIO; + buf += sizeof(u32); + to += sizeof(u32); + len_s -= sizeof(u32); + } + len8 = ALIGN_DOWN(len_s, sizeof(u64)); for (i = 0; i < len8; i += sizeof(u64)) { u64 data; @@ -289,6 +307,23 @@ static ssize_t spi_read(struct intel_dg_spi *spi, u8 region, from += from_shift; } + if (!IS_ALIGNED(from, sizeof(u64)) && + ((from ^ (from + len_s)) & GENMASK(31, 10))) { + /* + * Workaround reads/writes across 1k-aligned addresses + * (start u32 before 1k, end u32 after) + * as this fails on hardware. + */ + u32 data = spi_read32(spi, from); + + if (spi_error(spi)) + return -EIO; + memcpy(&buf[0], &data, sizeof(data)); + len_s -= sizeof(u32); + buf += sizeof(u32); + from += sizeof(u32); + } + len8 = ALIGN_DOWN(len_s, sizeof(u64)); for (i = 0; i < len8; i += sizeof(u64)) { u64 data = spi_read64(spi, from + i);